Crane and derrick



(No Model.)

W. S. DOAN.

CRANE AND DERRICK.

No. 329,148. Patented Oct. 27., 1885.

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NITED STATES PATENT rrrcn.

WVILLIAM S. DOAN, OF SACRAMENTO, ASSIGNOR OF ONE-HALF TO W'ALLAOE DOAN, OF SAN FRANCISCO, CALIFORNIA.

CRANE AND DERRICK.

CPECIFICATION forming part of Letters Patent No. 329,148, dated October 27,1885.

Application filed November 20, 1884. Serial No. 148,453. (No model.)

To aZZ whom it may concern.-

Be it known that I, WILLIAM S. DOAN, of the city and county of Sacramento, State of California, have invented an Improvement in Cranes and Derricks; and I hereby declare the following to be a full, clear, and exact description of the same.

My. invention relates to the class of dredging-machincs; and it consists in a boom-sup-,

1o porting mast adapted to be rotated by means of a turn-table at its base, in a novel boom supported by the mast and provided with a counter-weight extension, and in certain details of construction, which I shall describe and claim.

The object of my invention is to provide a simple and effective crane or derrick adapted for use either on land or water, and which,by reason of its construction, can be readily and 2 easily handled, as I shall hereinafter explain.

Referring to the accompanying drawing, the figure is a perspective view of my dredger.

A is a platform, which may be mounted on suitable wheels for land use, or may be set directly and fixed upon a boat. Upon this platform is a circular track, B.

G is the mast, the lower end of which is suitably stepped in the platform at the center of the track B, and D is a disk or pulley rigidly fixed upon the lower end of the mast and provided with wheels d,which travel upon the circular track B, thus forming a turntable. Arms 2) are secured to the periphery of the track B and extend up past the periphery of the pulleyor disk D, and have upon their upper ends rollers b, which bear upon the upper surface of said disk and serve to steady the turn-table.

E are braces extending from disk D to the 40 top of the mast, whereby the mast and disk are rigidly secured together.

F is the boom, the inner end of which finds a bearing and support against the mast in a socket or notch near its lower end.

G is an arm,the inner end of which likewise finds a bearing and support against the mast, and is secured rigidly to the inner end of the boom F by means of the tie-straps g. The arm G extends in a direction opposite to the boom F, and has upon its outer end a weight, W, whereby it becomes a counter-weight extension to the boom F, serving to hold it in position and counterbalance the Weight of the dipper and its load.

The outer end of the boom is connected and supported from the top of the mast by a chain,

H, and the outer end of the extension-arm G is likewise supported from the top of the mast by a chain, H. It will be observed that by reason of the boom bearing, as shown, against 6 the mast it can move through its circular path only by reason of the rotation of the mast itself, and this is the idea or object in this construction, for it is intended that the boom shall be moved and adjusted to the proper 6 position by the rotation of the mast, which is effected by means of a rotary movement imparted to the turntable disk D. This-rotary movement is given by means of a chain, I, which extends to a chain-pulley, i, from which 79 the driving-belt J extends. Thus by the rotation'of the turn-table the boom is adjusted to the proper position.

The object of the turn-table is to suitably brace and sustain the mast without having to resort to guys, which extend to a great distance, and therefore this dredger can be used in a more contracted space, and is more easily adjusted to its place.

Having thus described my invention, what I 80 claim as new, and desire to secure by Letters Patent, is-

1. In a crane or derrick, the wheeled turntable disk or pulley D, the mast O, secured thereto,and the braces E, joining the disk and 8 mast, in combination with a boom, F, supported by a socket and deriving its movement from the rotation of the mast, and a counterweight extension, G, substantially as described.

2. The mast 0, having a socket near its lower end,and the boom F,supported thereby, in combination with the turntable disk or pulley D, to which the base of the mast is secured, the upper and lower pulleys, b and d, and the driving-chain I, by which the turntable D is rotated to rotate the mast and adjust the boom, substantially as herein described.

3. The platform A, having a circular track,

B, in combination with the mast Qstepped in the platform, the disk or pulley D, secured to the base of the mast, the wheels (I, traveling on the track, the steadying-wheels b, and the boom F, supported in a socket in the lower end of the mast, substantially as herein described.

4. In a crane or derrick, the mast G, in combination with the boom F and a counterweight extension, G,substantial1y as described.

5. In a dredger,the mast G, in combination with the boom F, the inner end of which bears against and is supported by the mast, and the weighted arm G, the inner end of which bears against and is supported by the mast, and is rigidly secured to the inner end of the boom, substantially as herein described. I

6. In adredger, the mast 0, adapted to have a rotary movement, in combination with the boom F, the weighted arm G, and the uniting- WILLIAM S. DOAN.

Witnesses:

S. H. NOURSE, H. 0. LEE. 

